Physiology

Physiology Pectoroplasty

Physiology of Pectoralis

Physiology of Pectoralis Major

The function of the pectoralis major is different for its different heads.

The clavicular head flexes the humerus, and
the sternocostal head adducts the humerus.

As a whole the action is to adduct and medially rotate the humerus. It also draws the scapula anteriorly and inferiorly.

Physiology of Pectoralis Minor

Stabilizes the scapula by drawing it inferiorly and anteriorly against the thoracic wall, raises ribs in inspiration.

The Pectoral Girdle

There is a pectoral girdle above each arm, consisting of a scapula (shoulder blade) and a clavicle (collar bone). The shoulder girdle, also known as the pectoral girdle, forms a socket and support system for the upper limb